diff --git a/mamelink/Makefile b/mamelink/Makefile
index 830b941..6df41cd 100644
--- a/mamelink/Makefile
+++ b/mamelink/Makefile
@@ -1,3 +1,6 @@
 all: mamelink.o down
 
 down: mamelink.o down.o
+
+clean:
+	rm -f *.o down
\ No newline at end of file
diff --git a/mamelink/mamelink.c b/mamelink/mamelink.c
index 609ab2b..b1d3b78 100644
--- a/mamelink/mamelink.c
+++ b/mamelink/mamelink.c
@@ -77,15 +77,18 @@ static void simple_cmd(char command) {
     send_cmd_and_close(prepare_cmd(command));
 }
 
-void Init(char *initial_link_dir) {
+int Init(char *initial_link_dir) {
     if (initial_link_dir == NULL) {
         initial_link_dir = getenv("MAMELINK");
     }
-    assert(initial_link_dir != NULL);
+    if (initial_link_dir == NULL) {
+        return 0;
+    }
     if (linkdir != NULL) {
         free(linkdir);
     }
     linkdir = strdup(initial_link_dir);
+    return 1;
 }
 
 void Finish() {
diff --git a/mamelink/mamelink.h b/mamelink/mamelink.h
index 7efe87a..7d66e9e 100644
--- a/mamelink/mamelink.h
+++ b/mamelink/mamelink.h
@@ -1,4 +1,4 @@
-void Init(char *initial_link_dir);
+int Init(char *initial_link_dir);
 void Finish();
 void down(char *buf, unsigned short bytes, unsigned short c64Addr);
 void up(char *buf, unsigned short bytes, unsigned short c64Addr);
diff --git a/mamelink/out2prg.js b/mamelink/out2prg.js
new file mode 100644
index 0000000..527abf1
--- /dev/null
+++ b/mamelink/out2prg.js
@@ -0,0 +1,55 @@
+const fs = require('node:fs/promises');
+const assert = require('node:assert/strict');
+
+const die = (...message) => {
+    console.error(...message)
+    process.exit(1)
+}
+
+if (process.argv.length != 3) {
+    die("Usage: node out2prg.js FILE.out")
+}
+
+const replaceExtension = (filename, ext) => {
+    const idot = filename.lastIndexOf(".")
+    return `${idot < 0 ? filename : filename.substr(0, idot)}.${ext}`
+}
+(async () => {
+    const outfilename = process.argv[2]
+    const data = await fs.readFile(outfilename)
+    assert.equal(data.readUint16LE(0), 0xffff, `${outfilename} does not start with magic FFFF bytes`)
+    const prgfilename = replaceExtension(outfilename, "prg")
+    const prgfile = await fs.open(prgfilename, "w")
+    try {
+        let off = 2
+        let nextAddress = null
+        let bootAddr = null
+        while (off < data.length) {
+            const startAddr = data.readUint16LE(off)
+            const endAddr = data.readUint16LE(off + 2)
+            if (startAddr == endAddr && bootAddr == null) {
+                bootAddr = startAddr
+                console.log(`To start, type SYS${bootAddr}`)
+                console.log(`Skipping byte: ${data.readUint8(off + 4)}`)
+                off += 5
+                continue
+            }
+            assert.ok(endAddr >= startAddr, `Invalid address range ${startAddr}:${endAddr}`)
+            assert.ok(nextAddress == null || startAddr >= nextAddress, `Expected ${startAddr} to come after previous segment ending at ${nextAddress}`)
+            const paddingLength = nextAddress == null ? 0 : startAddr - nextAddress
+            const blobLength = endAddr - startAddr + 1
+            if (nextAddress == null) {
+                await fs.writeFile(prgfile, data.subarray(off, off + 2))
+            }
+            if (paddingLength > 0) {
+                await fs.writeFile(prgfile, Buffer.alloc(paddingLength))
+            }
+            off += 4
+            await fs.writeFile(prgfile, data.subarray(off, off + blobLength))
+            nextAddress = endAddr + 1
+            off += blobLength
+        }
+    } finally {
+        await prgfile.close()
+    }
+})()
\ No newline at end of file
diff --git a/mamelink/reno.d64 b/mamelink/reno.d64
new file mode 100644
index 0000000..886649b
Binary files /dev/null and b/mamelink/reno.d64 differ
diff --git a/mamelink/reno.prg b/mamelink/reno.prg
new file mode 100644
index 0000000..918825e
Binary files /dev/null and b/mamelink/reno.prg differ